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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45660de5edbe742deef58fea3d379c077c791bd70249d4bf3978738498fd6c8f' 
  AND token = 'G8KWAc6HgRuP/UgNSqBRXsx4SWFP1+XfQbLAfhUDIWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}